Toolholder



J. W. CLARK April 22, 1952 TOOLHOLDER Filed Nov. l26, 1947 .blair-:L

INVENTOR.

daf//v W, MR/f asallvs Patented Apr. 22, 1952 UNITED STATES PATENT-OFFICE TOOLHOLDER John Wesley Clark, Buffalo, Mo.

Application November 26, 1947, Serial No. '788,237

5 Claims. (Cl. 51 218) In general, the present invention relates to tool holders and, in its more specific application. it has reference to a novel holding device for holding watchmakers tools, such as screw drivers. during the sharpening process of the screw driver. It is to be understood, however, that my inventive conceptl is not thus limited, as it may be employed with equally eicient results for sharpening or otherwise working upon various types of tools.

One object of my invention is to provide a tool holder for holding a tool in a predetermined position with respect to a grinding surface which may be readily secured to or detached from the support for the grinding tool.

Another object of my invention is to provide a tool holder for watchmakers screw drivers or the like, which is so designed that each side of the screw driver may be presented to the grinding tool by a simple adjustment of the holder.

And yet a further object of my invention is to provide a tool holder of the character described which is simple in construction and peration, and which includes few, essential working parts.

With the foregoing and other objects in view,

the invention consists inthe details of construction, and in the arrangement and combination of parts to be hereinafter more fully setforth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this application, wherein like characters denote corresponding parts in the several views, and in which:

Figure 1 is a View in side elevation, showing the manner in which my tool holder is mounted on a watchmakers lathe provided with a grinding wheel for sharpening the sides of a screw driver.

Figure 2 is an enlarged view in side elevation of the tool holder and its bracket for detachably connecting the tool holder to a supporting surface.

Figure 3 is a top plan View of the holder shown Referring to Figure 1, I have shown a watchmakers lathe I!) having a grinding wheel II afxed thereto, and a watchmakers screw driver designated I2V is mounted in my novel holding 'device indicated generally I3, which is suitably supported on the lathe frame I0.

The tool holder I3 comprises a supporting bracket I4 which is slotted at one end as shown at I5 to enable the bracket to be suitably secured to any supporting surface. Secured within aperture I6 in the bracket I4 is a vertical tube-like member I1. A plug I8 having a central bore I9 is disposedin `the-lower part of the tube I1, and a rod 20 having a head 2| at its upper end is mounted for vertical sliding movement in the bore I9 and is normally forced upwardly by a helical spring 22. The upper end of the tube I1 is formed with a pair of oppositely disposed inturned ears 23 4which will prevent the head 2l being forced out of the open end of the tube I1.

Telescoping on the tube I1 is a second tube-like member 24. the diameter of which is slightly greater'than that of tube I1 so that the tube 24 may have easy sliding movement on the tube I1. The upper end ofthe tube 24 is formed with oppositely disposed horizontal portions y25 to which is suitably secured a horizontally disposed tube 26. Mounted withinthe tube 26 is a tubular member21 provided with a knurled operating head 28 at the rear end thereof.` The tube-like member 21 may be rotated by proper manipulation of the head 28. Intermediate the length of lthe tube 26,'it will be observed that the tube is provided with an arcuate slot 29. That portion of the tube 21 which is disposed in the slot 29 is formed with a boss 30 having a threaded bore 3l. A screw 32 is adapted to thread into the threaded bore 3| and carries an operating head 33 at its outer end.

When it is desired to sharpen the tool I2,\the

screw 32 is rotated so that it will be withdrawn from the interior of the tube-like member 21, and the tool is inserted through this member. After the tool I2 has been properly located in the memf ber 21, the screw is manipulated to hold it against the tube-like member 21. as shown in Figure 5.

The tube I1 is formed with a pair of opposed slots 34 and the tube 24 is formed with opposed apertures 35. A pin 35 extends through the apertures 35 and slots 34 immediately above the head 2I on the rod 20. Manifestly, the spring 22 will urge the rod 20 upwardly to maintain the outer tube 24 in the position shown in Figure 5.

When it is desired to use the device and the tool I2 is suitably locked in the tube-like meinber' 21, the operator applies a slight pressure to the tube 26, thereby forcing tube 21 downwardly on the tube I1 against the action of the spring 22 to bring the edge of the tool I2 into contact with the grinding wheel II. After one side of the screw driver has been properly sharpened, the operator may give the head 33 a slight flip to rotate it from the position shown in Figure 5 to that shown in Figure 6, in order that the opposite side of the screw driver may be workedv upon. After the sharpening process is completed, the pressure on the tube 26 is released and the spring will move the tube 21 upwardly, thus raising the tool I2 away from the grinding wheel I I.

Another important feature in the present invention is the provision of a levelling screw 38 which is mounted in the upper edge 'of the tube 24 intermediate the slot 29. The purpose of the screw 38 is toeffect an adjustment whereby the bit of the screw driver `is maintained flat against the grinding wheel. Often one corner of the screw driver bit will be of greater thickness than the other corner. Hence, by proper manipulation of the screw in its threaded aperture, the bit will be moved to a level position relative Vto the grinding wheel and, as a consequence, after the grinding operation, the bit will have a uniform thickness.

I claim:

l. In a device for hold-ing a watchmakers tool against a sharpening surface, a vertical hollow post, a tube slidablymounted on the post, a hollow support on the `free end of the tube disposed at right anglesit'o the tube, a tool holder mounted within the hollow support for rotational movement therein, saidf hollow support having a slot intermediate the ends thereof, a boss on the tool holder extending through the slot, a screw threaded into the boss l for securing the tool in the holder, said boss and slot permitting the holder to rotate 180 degrees to present different faces of the tool to the `sharpening surface, and spring means within said hollow post and cooperating with said tube to urge the tube and tool holder away from the sharpening surface.

2. In a device forsharpening a. tool, a sharpening surface, a support member mounted in operative relation to the sharpening surface, a vertical post on said support member, a tube telescopically mounted on said post, a hollow support on the free end of the tube disposed at right angles to the tubel a tool holder mounted within said hollow support for rotational move- 4 ment therein, said hollow support having a slot intermediate the ends thereof, a projection on the tool holder extending through the slot, means on the tool holder to secure the tool in said holder, the said projection and slot permitting the holder to rotate degrees to present different faces of the tool to the sharpening surface, vand spring means cooperating with said tube to urge the tube and tool holder away from the sharpening surface.

3. A device as claimed in claim 2 wherein said tool h-Older is provided with a knurled head for rotating the holder.

4. A device as claimed in claim 1 wherein the tool holder is provided with a knurled operating head to rotate said tool holder.

5. In a device for sharpening a tool, a sharpening surface, a sup-port member mounted in operative relation to the sharpening surface, a vertical post on said support member, a tube telcscopically mounted on said post, a hollow support on the free end of the tube disposed at right angles to the tube, a tool holder mounted within said hollow support for rotational movement therein, means on said tool holder for securing the tool therein, couplemental means on the follow support and the tool holder to permit the holder to rotate degrees to present different faces of the tool to the sharpening surface, and spring means cooperating with said tube to urge the tube and tool holder away from the sharpening surface.

JOHN WESLEY CLARK.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 535,021 Rivett Mar. 5, 1895 688,384 Brooks Dec. 10, 1901 993,734 Thielemann May 30, 1911 1,377,884 Heryngfel et al. May 10, 1921 1,481,260 Hemmenway Jan. 22, 1924 2,110,441 Kasch Mar. 8, 1938 2,124,093 Wells July 19, 1938 2,151,528 Preston Mar. 21, 1939 2,346,300 Guy Apr. 1l, 1944 2,347,087 Dayarmond Apr. 18, 1944 2,368,077 McCarthy Jan. 23, 1945 2,432,058 Wiken et al Dec. 2, 1947 

